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参数资料
| 型号： | FSEZ1317AMY-F116 |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 53 kHz SWITCHING FREQ-MAX, PDSO7 |
| 封装： | GREEN, MS-012AA, SOP-8/7 |
| 文件页数： | 3/16页 |
| 文件大小： | 1031K |
| 代理商： | FSEZ1317AMY-F116 |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSEZ1317A Rev. 1.0.1
11
FSEZ1317A
—
Prima
ry-Side-Regulation
PWM
with
P
O
WER
MOSFET
Integrated
Cable Voltage Drop Compensation
In cellular phone charger applications, the battery is
located at the end of cable, which typically causes
several percentage of voltage drop on the battery
voltage. FSEZ1317A has a built-in cable voltage drop
compensation that provides a constant output voltage at
the end of the cable over the entire load range in CV
mode. As load increases, the voltage drop across the
cable is compensated by increasing the reference
voltage of the voltage regulation error amplifier.
Operating Current
The FSEZ1317A operating current is as small as
2.5mA, which results in higher efficiency and reduces
the VDD hold-up capacitance requirement. Once
FSEZ1317A enters “deep” green mode, the operating
current is reduced to 0.95mA, assisting the power
supply in meeting power conservation requirements.
Green-Mode Operation
The FSEZ1317A uses voltage regulation error amplifier
output (VCOMV) as an indicator of the output load and
modulates the PWM frequency as shown in Figure 26.
The switching frequency decreases as the load
decreases. In heavy load conditions, the switching
frequency is fixed at 50kHz. Once VCOMV decreases
below 2.5V, the PWM frequency linearly decreases from
50kHz. When FSEZ1317A enters deep green mode, the
PWM frequency is reduced to a minimum frequency of
370Hz, thus gaining power saving to meet international
power conservation requirements.
Figure 26. Switching Frequency in Green Mode
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. FSEZ1317A has an internal frequency
hopping circuit that changes the switching frequency
between 46kHz and 54kHz over the period shown in
Figure 27.
Figure 27. Frequency Hopping
High-Voltage Startup
Figure 28 shows the HV-startup circuit for FSEZ1317A
applications. The HV pin is connected to the line input or
bulk capacitor through a resistor, RSTART (100k
recommended). During startup status, the internal
startup circuit is enabled. Meanwhile, line input supplies
the current, ISTARTUP, to charge the hold-up capacitor,
CDD, through RSTART. When the VDD voltage reaches
VDD-ON, the internal startup circuit is disabled, blocking
ISTARTUP from flowing into the HV pin. Once the IC turns
on, CDD is the only energy source to supply the IC
consumption current before the PWM starts to switch.
Thus, CDD must be large enough to prevent VDD from
dropping down to VDD-OFF before the power can be
delivered from the auxiliary winding.
Figure 28. HV Startup Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSEZ1317MY | 功能描述:初级与次级侧 PWM 控制器 EZSWITCH PSR PWM Cont. w/ Int. MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ1317NY | 功能描述:初级与次级侧 PWM 控制器 EZSWITCH PSR PWM Cont. w/ Int. MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ1317WAMY | 功能描述:初级与次级侧 PWM 控制器 PSR PWM Controller w/MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ13X7 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Primary Side Regulated (PSR) Flyback Converter |
| FSEZ2007NY | 功能描述:电压模式 PWM 控制器 Low-Power Green-Mode EZSWITCH RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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